如何修复 AppCenter 构建错误 NETSDK1004

Question

我决定尝试使用 AppCenter CI 在 Android 和 iOS 上构建我的 Xamarin 项目。

但是，我遇到了直接在 VisualStudio 中构建时没有遇到的构建错误。你知道如何解决这个问题吗？因为它告诉我运行 Nuget Package 还原，但在构建期间 NugetPackage 被还原。

Installed:
    168 package(s) to packages.config projects
##[section]Finishing: Restore Nuget
##[section]Starting: Build Xamarin.Android project 

error NETSDK1004: Assets file '/Users/vsts/agent/2.148.1/work/1/s/MyProject/MyProject/obj/project.assets.json' not found. Run a NuGet package restore to generate this file. [/Users/vsts/agent/2.148.1/work/1/s/MyProject/MyProject/MyProject.csproj]

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.99
##[error]Error: /Library/Frameworks/Mono.framework/Versions/5_16_0_0/bin/msbuild failed with return code: 1

构建输出日志：

https://drive.google.com/open?id=1uWbhzDOEF6KoRlC8iGhD_ro9NEyeODu5

我在 AppCenter 的构建设置中检查了目标 SDK 版本，我的目标是 SDK 9.1 (Mono 5.16) ...但是，我将其更改为 SDK 9.0 (Mono 5.12)，所以我的目标是我的项目，可能还在这里。

编辑：我在 appcenter 恢复 nuget 包时也注意到了这个错误：

[command]/bin/bash -c /usr/bin/find . -name '*.sln' -type f -print0 | /usr/bin/xargs -0 grep -l '***.Droid.csproj' | /usr/bin/xargs -I '{}' nuget restore '{}' -DisableParallelProcessing
MSBuild auto-detection: using msbuild version '15.0' from '/Library/Frameworks/Mono.framework/Versions/5.12.0/lib/mono/msbuild/15.0/bin'.
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018: The "WriteRestoreGraphTask" task failed unexpectedly. [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018: NuGet.Commands.RestoreCommandException: PackageTargetFallback and AssetTargetFallback cannot be used together. Remove PackageTargetFallback(deprecated) references from the project environment. [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.AssetTargetFallbackUtility.EnsureValidFallback (System.Collections.Generic.IEnumerable`1[T] packageTargetFallback, System.Collections.Generic.IEnumerable`1[T] assetTargetFallback, System.String filePath) [0x0002d] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.AddPackageTargetFallbacks (NuGet.ProjectModel.PackageSpec spec, System.Collections.Generic.IEnumerable`1[T] items) [0x000cb] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.GetPackageSpec (System.Collections.Generic.IEnumerable`1[T] items) [0x002b3] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at System.Linq.Enumerable+SelectEnumerableIterator`2[TSource,TResult].MoveNext () [0x00048] in <cc3b329d40bd4675ae0e985e302972af>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at System.Linq.Enumerable+WhereEnumerableIterator`1[TSource].MoveNext () [0x0004e] in <cc3b329d40bd4675ae0e985e302972af>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.GetDependencySpec (System.Collections.Generic.IEnumerable`1[T] items) [0x001f8] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Build.Tasks.WriteRestoreGraphTask.Execute () [0x000a5] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in <2338fdb301034c1d9c6b95e564d514b0>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at Microsoft.Build.BackEnd.TaskBuilder+<ExecuteInstantiatedTask>d__26.MoveNext () [0x00212] in <2338fdb301034c1d9c6b95e564d514b0>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]

WARNING: Error reading msbuild project information, ensure that your input solution or project file is valid. NETCore and UAP projects will be skipped, only packages.config files will be restored.

Answer 1

终于解决了我的问题。

1/ 我的项目中有一个不在 nuget 上的外部程序集。我读到如果有一个不依赖于 Nuget 的程序集，appcenter 就无法构建项目/恢复 nuget。所以我用作者提供的 nuget 更新了这个程序集。

2/ 我使用原木进行的编辑使我走上了正确的道路。

“WriteRestoreGraphTask”任务意外失败

解决方案是编辑项目 .csproj 并修改允许从 .NET 4.5 回退的行

<PackageTargetFallback>$(PackageTargetFallback);portable-net45+win8+wp8+wpa81;</PackageTargetFallback>

到

<AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

参考：https://intercom.help/appcenter/build/xamarin/xamarin-build-fails-with-the-writerestoregraphtask-task-failed-unexpectedly

现在我成功构建了。

Answer 2

我在使用 NETSDK1004 时遇到了类似的错误。由于早期的失败，似乎 project.assets.json 永远不会生成。

产生错误

error NETSDK1004: Assets file '/Users/runner/work/1/s/.../project.assets.json' not found. Run a NuGet package restore to generate this file.

实际错误

在我的情况下，App Center 的 9_Restore_Nuget 任务中有一个较早的错误：NETSDK1045。

error NETSDK1045: The current .NET SDK does not support targeting .NET Core 3.1.  Either target .NET Core 2.2 or lower, or use a version of the .NET SDK that supports .NET Core 3.1. 

我在其中放置了一个针对 net core 3.1 的 DLL - App Center 不喜欢它，然后包还原失败。

因此，最初的错误是正确的 - project.assets.json 不存在，但有一个原因需要在构建过程的早期探索。